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<div class="subsection-level-extent" id="Alpha-Built_002din-Functions">
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<h4 class="subsection" id="Alpha-Built_002din-Functions-1"><span>6.60.2 Alpha Built-in Functions<a class="copiable-link" href="#Alpha-Built_002din-Functions-1"> &para;</a></span></h4>

<p>These built-in functions are available for the Alpha family of
processors, depending on the command-line switches used.
</p>
<p>The following built-in functions are always available.  They
all generate the machine instruction that is part of the name.
</p>
<div class="example smallexample">
<pre class="example-preformatted">long __builtin_alpha_implver (void);
long __builtin_alpha_rpcc (void);
long __builtin_alpha_amask (long);
long __builtin_alpha_cmpbge (long, long);
long __builtin_alpha_extbl (long, long);
long __builtin_alpha_extwl (long, long);
long __builtin_alpha_extll (long, long);
long __builtin_alpha_extql (long, long);
long __builtin_alpha_extwh (long, long);
long __builtin_alpha_extlh (long, long);
long __builtin_alpha_extqh (long, long);
long __builtin_alpha_insbl (long, long);
long __builtin_alpha_inswl (long, long);
long __builtin_alpha_insll (long, long);
long __builtin_alpha_insql (long, long);
long __builtin_alpha_inswh (long, long);
long __builtin_alpha_inslh (long, long);
long __builtin_alpha_insqh (long, long);
long __builtin_alpha_mskbl (long, long);
long __builtin_alpha_mskwl (long, long);
long __builtin_alpha_mskll (long, long);
long __builtin_alpha_mskql (long, long);
long __builtin_alpha_mskwh (long, long);
long __builtin_alpha_msklh (long, long);
long __builtin_alpha_mskqh (long, long);
long __builtin_alpha_umulh (long, long);
long __builtin_alpha_zap (long, long);
long __builtin_alpha_zapnot (long, long);
</pre></div>

<p>The following built-in functions are always with <samp class="option">-mmax</samp>
or <samp class="option">-mcpu=<var class="var">cpu</var></samp> where <var class="var">cpu</var> is <code class="code">pca56</code> or
later.  They all generate the machine instruction that is part
of the name.
</p>
<div class="example smallexample">
<pre class="example-preformatted">long __builtin_alpha_pklb (long);
long __builtin_alpha_pkwb (long);
long __builtin_alpha_unpkbl (long);
long __builtin_alpha_unpkbw (long);
long __builtin_alpha_minub8 (long, long);
long __builtin_alpha_minsb8 (long, long);
long __builtin_alpha_minuw4 (long, long);
long __builtin_alpha_minsw4 (long, long);
long __builtin_alpha_maxub8 (long, long);
long __builtin_alpha_maxsb8 (long, long);
long __builtin_alpha_maxuw4 (long, long);
long __builtin_alpha_maxsw4 (long, long);
long __builtin_alpha_perr (long, long);
</pre></div>

<p>The following built-in functions are always with <samp class="option">-mcix</samp>
or <samp class="option">-mcpu=<var class="var">cpu</var></samp> where <var class="var">cpu</var> is <code class="code">ev67</code> or
later.  They all generate the machine instruction that is part
of the name.
</p>
<div class="example smallexample">
<pre class="example-preformatted">long __builtin_alpha_cttz (long);
long __builtin_alpha_ctlz (long);
long __builtin_alpha_ctpop (long);
</pre></div>

<p>The following built-in functions are available on systems that use the OSF/1
PALcode.  Normally they invoke the <code class="code">rduniq</code> and <code class="code">wruniq</code>
PAL calls, but when invoked with <samp class="option">-mtls-kernel</samp>, they invoke
<code class="code">rdval</code> and <code class="code">wrval</code>.
</p>
<div class="example smallexample">
<pre class="example-preformatted">void *__builtin_thread_pointer (void);
void __builtin_set_thread_pointer (void *);
</pre></div>

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